Dive Theory Mock Exam A

Dive Theory Mock Exam A

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7) If a sealed, inflexible, air filled container with a volume of 3 litres is taken to a depth of 30m, the volume will ? a) increase b) decreasec) remain unchanged d) the answer cannot be determined

8) A scuba tank containing 1% of carbon monoxide at the surface is taken to 30m, if a diver were to breathe from the tank at this depth, it would have the same effect as breathing __ % of carbon monoxide at the surface? a) 1% b) 2% c) 3%d) 4%

9) If an air filled balloon is taken from the surface to 40m, what will happen to the volume of the balloon?a) the volume decreases to 1/5 th b) the volume halves c) the volume increases by 1/5th d) the volume remains unchanged

10) If a balloon and a scuba tank are both filled with air at room temperature and then placed outside in near freezing conditions, what will happen to each? a) the volume of the balloon and tank will both increaseb) the volume of the balloon will decrease and the pressure in the tank will decrease c) the volume of the balloon will increase and the pressure in the tank will increase d) the volume of the balloon and tank will both decrease

11) If the ambient pressure surrounding an open liquid filled container that is saturated with nitrogen is rapidly decreased, what will happen to the gas?a) the gas comes out of solution & bubbles may form b) remains unchanged c) the gas dissolves into the solution d) the gas becomes toxic

12) Approximately how much air must be pumped down from the surface to fill a 40 litre container if the container lies in 40m of salt water? a) 40 litres b) 80 litres c) 160 litresd) 200 litres

Physiology

1) Gas exchange between the tissues and the blood occurs: a) in the heart b) in the arteries c) in the veinsd) in the capillaries

2) To avoid problems with dead air space: a) dive well within dive table limitsb) breathe slowly with deep, normal breaths c) avoid wearing a restrictive dry suit d) equalize air spaces early and often

6) Decompression illness is:a) a blanket term for DCS & lung over expansion injuries b) the preferred term for arterial gas embolism c) a term that describes any pressure-related condition d) a term interchangeable with “decompression sickness”

8) A pneumothorax results when air from a lung over-expansion injury: a) accumulates at the base of the neck b) accumulates over the centre of the chest and presses on the heartc) collapses a lung d) enters the bloodstream

9) For which lung over-expansion injury would you give the patient emergency oxygen and apply other first aid for DCI steps? a) air embolism b) pneumothorax c) medistinal emphysemad) all of the above

10) Silent bubbles are:a) small bubbles in the bloodstream after a dive that do not cause decompression sickness b) bubbles that accumulate under the skin and cause subcutaneous emphysema c) bubbles that interfere with nerve transmission and cause narcosis d) bubbles found anywhere that a barotrauma occurs

12) An enriched air diver who makes a dive that exceeds an oxygen partial pressure of 1.4 – 1.6 ata runs an unacceptable risk of: a) convulsion and drowning due to pulmonary oxygen toxicity b) a cough and burning chest due to pulmonary oxygen toxicityc) convulsion and drowning due to CNS oxygen toxicity d) a cough and burning chest due to CNS oxygen toxicity

Recreational Dive Planner

1) Using the RDP above ______ requires the use of special procedures including the conversion of actual depth to theoretical depth. To use theoretical depth tables, you must know the ______.a) 300 metres (1000 feet) / altitude of the dive b) 300 metres (1000 feet) / barometric pressure of the dive c) 3000 metres (1000 feet) / planned dive depth d) 2400 metres (8000 feet) / altitude of the dive

3) Because the Recreational Dive Planner was designed using a faster “gas washout” tissue compartment than previous dive tables, it allows: a) longer, deeper dives b) shorter surface interval times c) longer bottom times on repetitive divesd) both b and c are correct

4) The pressure group designations on the Recreational Dive Planner are _________ with the pressure group letters used on other dive table models. a) interchangeableb) not interchangeable c) equivalent d) transferable when a conversion factor is used

7) What is the no decompression limit for a dive to 15m?a) 72 minutes b) 98 minutes c) 56 minutes d) 70 minutes

8) A diver exits the water in pressure group K, what is the pressure group after a 52 minute surface interval? a) A b) B c) Cd) D

9) You have just made two dives, the first to 25m for 14 minutes and the second dive to 23m for 17 minutes a 45 minute surface interval between them. What is the minimum required surface interval for a dive to 21m for 17 minutes? a) 35 minutes b) 38 minutesc) 39 minutes d) 42 minutes

10) For your first dive of the day, you would like to dive for one hour. What’s the deepest depth possible for a one hour dive?a) 16m b) 18m c) 20m d) 22m

11) You’re planning a multilevel dive. The first level will be at 29m for 18 minutes. What is the no decompression limit for the next level at 20m? a) 8 minutesb) 10 minutes c) 12 minutes d) 14 minutes

12) You’re planning a multilevel dive. The first level is at 30m for 10 minutes. The second level is at 18m for 20 minutes.The third level is 10m for 72 minutes. What will your pressure group be when you reach the surface?a) W b) X c) Y d) Z

2) A rip current is caused by:a) water funneling back to sea through a narrow opening in a reef or sand bar b) waves approaching shore at a slight angle c) the rotation of the earth d) offshore wind pushing top water out to sea

3) Aquatic life injury signs and symptoms may include: a) severe pain b) numbness or paralysis c) cardiac arrestd) all of the above

4) If you encounter a thermocline while descending, you will experience: a) an abrupt transition from salt to fresh water b) a cool current rising up from the bottom c) a gradual change to salt waterd) an abrupt transition to colder water

5) Of those listed, select the most accurate method of measuring a short distance underwater a) kick cycles b) timed swim c) air consumptiond) arm spans

6) When sharing a single air source, on each exchange you should take: a) one breathb) two breaths c) three breaths d) one breath if you’re the donor and two if you’re the receiver

7) The generally recommended knot for making a reliable, easy to untie loop in a rope is: a) the square knot b) the clove hitchc) the bowline d) the sheet bend

8) The generally preferred method for providing rescue breaths to a non-breathing diver at the surface is:a) mouth to pocket mask b) mouth to mouth c) mouth to snorkel d) mouth to nose

9) You’re navigating in limited visibility with a compass and your sense of direction tells you that you are off course, even though your compass says you are not. Generally you should: a) disregard the compass and follow your sense of directionb) trust the compass c) compare your compass with your buddy’s to see if there is an error d) none of the above

10) In the vast majority of circumstances, entering an overhead environment requires: a) special equipment b) special training c) special proceduresd) all of the above

11) When breathing from a free flowing regulator:a) do not seal your lips around the mouthpiece b) make a continuous “ahhhhhh” sound c) drop your weights and ascend d) all of the above

4) If a scuba cylinder is exposed to excessive heat, it should be ________________ before use. a) visually inspectedb) hydrostatically / pressure tested c) emptied and refilled with fresh air d) repainted

6) A burst disk is intended to: a) rupture at 7 bar over a cylinder’s working pressure b) prevent an over-inflated BCD from rupturingc) rupture at pressure between 125% and 166% of a cylinder’s working pressure d) open more easily than a BCD’s normal exhaust valve

7) The type of scuba most commonly used by recreational divers is called:a) open circuit scuba b) semi-closed circuit scuba c) closed circuit scuba d) none of the above

9) An upstream valve is one that:a) opens against the flow of air b) opens with the flow of air c) may open with or against the flow of air, depending on the design d) is any valve in the first stage

10) A regulator that is designed so that tank air pressure either assists or resists the opening of valves is called: a) a diaphragm regulator b) a piston regulator c) a balanced regulatord) an unbalanced regulator

11) An analog SPG works based on the principle that: a) a sealed tube exposed to pressure tends to coil more tightlyb) pressure in a C-shaped tube tends to straighten it c) a spring-balanced piston resists movement d) a diaphram’s flexing under pressure can move a needle

12) When using dive computers: a) you have a more valid decompression model than when diving with tablesb) each diver should have a personal computer c) you can avoid many of the guidelines required when diving with tables d) all of the above

If you find this useful to your IDC Revision / Studies, you will be glad to hear that you can buy the full Exam Pack that includes 10 Standards and Dive Theory Mock PADI exams plus a bonus 75 question Pre-IDC Exam paper with answer keys.

Please click the link and BUY all 3 complete IDC revision packs that includes lots of revision documents and 11 practice mock exams, the exams include all the questions and answers you will need to revise to PASS the PADI IDC

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